go: fix build of 1.0.3

pkgs/development/compilers/go/1_0-gcc-bug.patch

@@ -0,0 +1,19 @@
+http://code.google.com/p/go/source/detail?r=8b13b2ec6b18
+--- a/src/cmd/cgo/gcc.go	2014-07-02 12:00:12.171796197 +0200
++++ b/src/cmd/cgo/gcc.go	2014-07-02 12:01:57.844472754 +0200
+@@ -840,6 +840,15 @@
+ func (p *Package) gccErrors(stdin []byte) string {
+ 	// TODO(rsc): require failure
+ 	args := p.gccCmd()
++
++	// GCC 4.8.0 has a bug: it sometimes does not apply
++	// -Wunused-value to values that are macros defined in system
++	// headers.  See issue 5118.  Adding -Wsystem-headers avoids
++	// that problem.  This will produce additional errors, but it
++	// doesn't matter because we will ignore all errors that are
++	// not marked for the cgo-test file.
++	args = append(args, "-Wsystem-headers")
++
+ 	if *debugGcc {
+ 		fmt.Fprintf(os.Stderr, "$ %s <<EOF\n", strings.Join(args, " "))
+ 		os.Stderr.Write(stdin)

pkgs/development/compilers/go/1_0-opt-error.patch

@@ -0,0 +1,12 @@
+https://code.google.com/p/go-wiki/wiki/OlderVersions
+--- a/src/cmd/cc/funct.c	2014-07-02 11:54:42.230663598 +0200
++++ b/src/cmd/cc/funct.c	2014-07-02 11:55:01.653790128 +0200
+@@ -269,7 +269,7 @@
+ 		goto bad;
+ 
+ 	f = alloc(sizeof(*f));
+-	for(o=0; o<sizeof(f->sym); o++)
++	for(o=0; o<nelem(f->sym); o++)
+ 		f->sym[o] = S;
+ 
+ 	t->funct = f;

pkgs/development/compilers/go/default.nix

@@ -51,7 +51,7 @@ stdenv.mkDerivation {
     sed -i '/TestHostname/areturn' src/pkg/os/os_test.go
   '';
 
-  patches = [ ./cacert.patch ];
+  patches = [ ./cacert.patch ./1_0-opt-error.patch ./1_0-gcc-bug.patch ];
 
   GOOS = "linux";
   GOARCH = if stdenv.system == "i686-linux" then "386"